The consequent (set of dependent variables) was composed of the International Roughness Index (IRI) and the Flexible Pavement Condition Index (FPCI).
For FPCI, the scale used ranged from 0.0 to 5.0, with 0.5 intervals.
'IF New Pavement (PN) AND Light Traffic (NL) THEN IRI = IRIO and FPCI = ICPFO'
For the defuzzification process and the obtaining of discrete values for IRI and FPCI, the center of area method was used.
Calculated values from developed fuzzy models were compared to observed values for IRI and FPCI indices.
For IRI, a correlation coefficient equal to r = 0.71 was found, and for FPCI, a correlation coefficient equal to r = 0.70 was obtained.
FPCi said the outlook for manufacturers was a lot brighter than a year ago, although tight credit conditions continued to constrain growth.
He said demand was returning in key sectors in which FPCi operates.